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Android Programming with Kotlin for Beginners

You're reading from   Android Programming with Kotlin for Beginners Build Android apps starting from zero programming experience with the new Kotlin programming language

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Product type Paperback
Published in Apr 2019
Publisher Packt
ISBN-13 9781789615401
Length 698 pages
Edition 1st Edition
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Author (1):
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John Horton John Horton
Author Profile Icon John Horton
John Horton
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Table of Contents (31) Chapters Close

Preface 1. Getting Started with Android and Kotlin FREE CHAPTER 2. Kotlin, XML, and the UI Designer 3. Exploring Android Studio and the Project Structure 4. Getting Started with Layouts and Material Design 5. Beautiful Layouts with CardView and ScrollView 6. The Android Lifecycle 7. Kotlin Variables, Operators, and Expressions 8. Kotlin Decisions and Loops 9. Kotlin Functions 10. Object-Oriented Programming 11. Inheritance in Kotlin 12. Connecting Our Kotlin to the UI and Nullability 13. Bringing Android Widgets to Life 14. Android Dialog Windows 15. Handling Data and Generating Random Numbers 16. Adapters and Recyclers 17. Data Persistence and Sharing 18. Localization 19. Animations and Interpolations 20. Drawing Graphics 21. Threads and Starting the Live Drawing App 22. Particle Systems and Handling Screen Touches 23. Android Sound Effects and the Spinner Widget 24. Design Patterns, Multiple Layouts, and Fragments 25. Advanced UI with Paging and Swiping 26. Advanced UI with Navigation Drawer and Fragment 27. Android Databases 28. A Quick Chat Before You Go A. Other Book You May Enjoy Index

Controlling loops with break and continue


Having just discussed all the ways that we can control looping through code, it is important to know that sometimes we need to break out of a loop earlier than the condition of the loop specifies.

For such occasions, Kotlin has the break keyword. Here is break in action with a while loop:

var countDown = 10
while(countDown > 0){

  if(countDown == 5)break

  Log.i("countDown =","$countDown")
  countDown --
}

In the preceding code, the condition of the while loop should make the code repeatedly execute while the countDown variable is greater than zero. However, inside the while loop, there is an if expression that checks to see whether countDown is equal to 5. If it is equal to 5, the break statement is used. Also, inside the while loop, the value of countDown is printed to the logcat window and is decremented (reduced by 1). Take a look at the following output when this code is executed:

countDown =: 10
countDown =: 9
countDown =: 8
countDown =:...
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